Specialised Process Challenge Devices (PCDs) for verification of cleaning efficiency
Cleaning of surgical instruments and endoscopes is considered the most difficult and most important of all decontamination processes. It is the only process that physically removes contamination from instrument surfaces and only clean surfaces can be effectively disinfected and sterilised. Routine verification of cleaning processes is essential to ensure compliance, and patients and staff safety.
VeriTest PCDs use VeriTest Tags – uniquely shaped samples, already inoculated with challenge-specific test soils. As surgical instruments come in a variety of materials. We believe that, for example, it is inappropriate to verify the inside of a flexible polymer endoscope channel with a stainless steel test.
For more realistic results we offer VeriTest Tags in:
Typically, process challenge devices (PCDs) only test one surface in one orientation – but all surgical instruments are three dimensional. This results in a shadowing effect, exposing different surfaces of the same instrument to different cleaning conditions.
This means that instruments are not cleaned evenly all around. Therefore, it is essential to evaluate all surfaces at the same time to properly verify the process. VeriTest Multi checks quality of cleaning of multiple surfaces at the same time: horizontal top and bottom side as well as vertical ones. Additionally it verifies cleaning ability inside of narrow gaps like ones found in box joint instruments.
VeriTest Multi is compatible with all variants of VeriTest tags – it is a true multitool.
PCD for hollow instruments
VeriTest Lumen were designed to work specifically with VeriTest Tags to realistically simulate cleaning of internal walls of narrow lumens. Lumens are typically cleaned with water and chemicals being flushed through under pressure. The volume and character of the flow are the critical parameters for effective cleaning.
The volume of the flow inside of a lumen directly translates into velocity. A constant diameter lumen will produce constant velocity of the flow along its length – any change on the diameter will result in a change of velocity – this is analogous to a river flow slowing down when it widens. Character of the flow also depends on velocity – the faster the flow the more turbulent it becomes – again compare a fast flowing mountain river to a steady flow in the lowlands.
Any PCD intended for evaluation of internal cleaning performance must be able to replicate the same flow conditions as found inside of narrow lumens – otherwise the test is not realistic. VeriLumen capsules were specifically designed and optimised using Computational Fluid Dynamics (CFD), so the fluid flow does not significantly change in velocity.
Additionally, the VeriTag is placed inside of the VeriLumen such that it becomes one of the walls of the capsule. This way no additional turbidity is created inside.
VeriLumen is the first PCD designed specifically to imitate the internal environment of a medical instrument.
VeriTest Lumen: variants
Developed to simulate rigid endoscopes,
these PCDs come in 400mm length.
Available in 1mm, 2mm and 4mm internal diameter equivalents.
VeriTest Lumen FlexE
Designed especially to simulate flexible endoscope cleaning verification. These PCDs come in 1.5m lengths, in 1mm and 2mm internal diameter equivalents.